22 terms

# more geometry terms

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acute angle
An angle that measures less that 90 and more than 0
alternate exterior angles
Two nonadjacent angles on opposite sides of a transversal and outside the lines crossed by the transversal.
alternate interior angles
Two nonadjacent angles on opposite sides of a transversal that are inside the lines crossed by the transversal.
angle bisector
A line or ray that divides an angle in half
base angles
The angles opposite the two equal sides in an isosceles triangles. A pair of angles that share a base as a common side in a trapezoid
complementary angles
Two angles that add up to 90
congruent triangles
Triangles that have the same shape and size
convex polygons
A polygon in which the measure of each angle is less than 180º
corresponding angles
Angles that are located in similar places along a transversal that intersects two lines; also, angles from congruent or similar figures in corresponding positions
exterior angle
An angle formed by one side of a polygon and the extension of an adjacent side
interior angle
The angle that open toward the inside of the polygon
isosceles triangle
A triangle with two sides of equal length
obtuse angle
An angle that measures more than 90 and less than 180
parallel lines
Straight lines in a plane that never intersect, no matter how far they are extended
reflex angle
An angle of measure greater than 180 and less than 360
scaling factor
The ratio of the lengths of corresponding sides of two similar figures
similar
Two objects such that the distance between any two points of one object is a particular constant times the distance between the corresponding points of the other object
straight angle
An angle that measures 180
supplementary angles
Two angles that add up to 180
transversal
A straight line that intersects two or more other coplanar straight lines at distinct points
vertical angles
Congruent angles that form opposite each other when two lines intersect
co-interior angles
Two nonadjacent angles on same sides of a transversal that are inside the lines crossed by the transversal